Miltaridis
New Member
Hi there i am currently working on an a assignment of creating a infrared link and have the following problem while trying to create the transmitter .
I have a 5v exit from a 4000 series ic in the form of a square wave and i use this current to drive a 2n3904 transistor which is connected as a common emitter which itself drives an ir led . The problem is that when the input's frequency gets higher than 256khz i dont get a clear waveform while measuring the voltage on the resistor protecting the led . can anyone give a tip about this ? Thank you
I have a 5v exit from a 4000 series ic in the form of a square wave and i use this current to drive a 2n3904 transistor which is connected as a common emitter which itself drives an ir led . The problem is that when the input's frequency gets higher than 256khz i dont get a clear waveform while measuring the voltage on the resistor protecting the led . can anyone give a tip about this ? Thank you